I2C Lines at 1.8V | Cypress Semiconductor
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I2C Lines at 1.8V
What should be the GPIO setting for I2C lines when they are used at 1.8V for CY8C2xxxx?
For Voh to support 1.8V I2C, I/O setting must be "OpenDrainLow" and external pull-up resistors should be there on SCL/SDA as per the I2C spec. The minimum value of the pull up resistance is dependent on the supply voltage. Maximum value depends on the bus capacitance and clock speed, such that the rise and fall times for the SCL and SDA as specified in the I2C specifications are met.